When takeoff and landing slots at Washington’s Reagan National Airport were allocated, 10% were reserved for private aviation. The airport's proximity to D.C., right across the river from the White House, has historically necessitated strict protocols. Following the events of 9/11, when the national air system was shut down for two days, Reagan National remained closed for 23 days.
Protocols for flying in and out of this airport became stricter over time. For a period, passengers were prohibited from using the lavatory during the first and last 30 minutes of flights taking off and landing at this airport.
Securing permission for non-commercial flights to use Reagan National is nearly impossible. Cabinet secretaries typically have to fly out of Washington Dulles when traveling on private planes. However, former President Trump’s campaign plane has been permitted to use Reagan National.